Here's my interpretation: a classical leap is when you are somewhere, you expend a bit of energy you have, and you end up somewhere else as a result. Basically,

Here's my interpretation: a classical leap is when you are somewhere, you expend a bit of energy you have, and you end up somewhere else as a result. Basically, you do something and something happens. A quantum leap, on the other hand, happens when you are somewhere just sitting, and boom, now you're somewhere else. It just happened randomly, without any energy input from you. So to bring this back to the idiom, an example of a quantum leap would be this: "I had a dream yesterday that gave me the insight I needed to finish my proof of XYZ theorem!"